In Exercises 55 and 56, the sums have been evaluated. Solve the given system for and to find the least squares regression line for the points. Use a graphing utility to confirm the result. 6b15b15a55a23.648.8(

L21 - 6 ex. Aditbedofitbyugi through an inverted cone-shaped ﬁlter. The height of the cone is 20 inches and the diameter across the top is 16 inches. If the liquid is ﬂowing out at 2 cubic in/min, how fast is the depth of the liquid changing when it is 12 inches deep